1. Houssine Makhlouf December 8th, 2008
OPTI 521 – Fall 2008
Synopsis of Technical Report: “Lens Mounting Techniques”, P.R. Yoder Jr.
Houssine Makhlouf
December 8th, 2008

2. Content Techniques to mount individual lenses
Analysis of stress in glass-metal interface
Application to real systems
Comments and conclusions

3. Mounting individual lenses 1/ Lens burnishing
Malleable material
Hardened tool pressing
Bent cell lip retains lens

4. Mounting individual lenses 2/ Snap ring
Groove inside cell
Insert fitting snap ring
Hard to remove
Quite permanent assembly

5. Mounting individual lenses 3/ Elastomer injection
Gap between lens and cell
Fill gap with resilient material
Hold lens axially
Inject and let cure

6. Mounting individual lenses 4/ Threaded retainer
Press lens against seat
Use threaded retaining ring
Holds lens firmly
Repeatable
Mount several elements in same housing

7. Mounting individual lenses Cut for seat and retainer
Square shape
most common and easiest to machine, can be beveled to reduce nicks and burrs
Tangent to lens surface
axial misalignment issue
Spherical with same radius of curvature as lens surface
hard to make precisely and expensive

8. Mounting individual lenses Cut for seat and retainer

9. Stress in glass-metal interface
Constrain lens position is important
Mounts cause stress
Stress depends on type of contact and temperature change
Tangential contact reduces dramatically preload stress
Models and formulas in Yoder’s paper

10. Some real system designs Military use or severe environment

11. Comments and Conclusion
Paper reports on lens mounting which is intended for all opto-mechanical scientists
Author computations show that special care about designs is really required for specific applications involving severe environment issues
Laboratory-type environment is pretty safe